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lib: sha256: add feature sha256_hmac

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Adds the support of the hmac based on sha256.
This implementation is based on rfc2104.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
Reviewed-by: Raymond Mao <raymond.mao@linaro.org>
This commit is contained in:
Philippe Reynes 2024-12-19 14:05:50 +01:00 • committed by Tom Rini
parent ccc5e16683
commit e364a9148f
3 changed files with 70 additions and 0 deletions
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4
include/u-boot/sha256.h
View file

@ -45,4 +45,8 @@ void sha256_finish(sha256_context * ctx, uint8_t digest[SHA256_SUM_LEN]);
void sha256_csum_wd(const unsigned char *input, unsigned int ilen,
unsigned char *output, unsigned int chunk_sz);
int sha256_hmac(const unsigned char *key, int keylen,
const unsigned char *input, unsigned int ilen,
unsigned char *output);
#endif /* _SHA256_H */

15
lib/mbedtls/sha256.c
View file

@ -10,6 +10,8 @@
#endif /* USE_HOSTCC */
#include <u-boot/sha256.h>
#include <mbedtls/md.h>
const u8 sha256_der_prefix[SHA256_DER_LEN] = {
0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
@ -33,3 +35,16 @@ void sha256_finish(sha256_context *ctx, uint8_t digest[SHA256_SUM_LEN])
mbedtls_sha256_finish(ctx, digest);
mbedtls_sha256_free(ctx);
}
int sha256_hmac(const unsigned char *key, int keylen,
const unsigned char *input, unsigned int ilen,
unsigned char *output)
{
const mbedtls_md_info_t *md;
md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
if (!md)
return MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE;
return mbedtls_md_hmac(md, key, keylen, input, ilen, output);
}

51
lib/sha256.c
View file

@ -264,3 +264,54 @@ void sha256_finish(sha256_context * ctx, uint8_t digest[32])
PUT_UINT32_BE(ctx->state[6], digest, 24);
PUT_UINT32_BE(ctx->state[7], digest, 28);
}
int sha256_hmac(const unsigned char *key, int keylen,
const unsigned char *input, unsigned int ilen,
unsigned char *output)
{
int i;
sha256_context ctx;
unsigned char keybuf[64];
unsigned char k_ipad[64];
unsigned char k_opad[64];
unsigned char tmpbuf[32];
int keybuf_len;
if (keylen > 64) {
sha256_starts(&ctx);
sha256_update(&ctx, key, keylen);
sha256_finish(&ctx, keybuf);
keybuf_len = 32;
} else {
memset(keybuf, 0, sizeof(keybuf));
memcpy(keybuf, key, keylen);
keybuf_len = keylen;
}
memset(k_ipad, 0x36, 64);
memset(k_opad, 0x5C, 64);
for (i = 0; i < keybuf_len; i++) {
k_ipad[i] ^= keybuf[i];
k_opad[i] ^= keybuf[i];
}
sha256_starts(&ctx);
sha256_update(&ctx, k_ipad, sizeof(k_ipad));
sha256_update(&ctx, input, ilen);
sha256_finish(&ctx, tmpbuf);
sha256_starts(&ctx);
sha256_update(&ctx, k_opad, sizeof(k_opad));
sha256_update(&ctx, tmpbuf, sizeof(tmpbuf));
sha256_finish(&ctx, output);
memset(k_ipad, 0, sizeof(k_ipad));
memset(k_opad, 0, sizeof(k_opad));
memset(tmpbuf, 0, sizeof(tmpbuf));
memset(keybuf, 0, sizeof(keybuf));
memset(&ctx, 0, sizeof(sha256_context));
return 0;
}